Wiluna total count grid geodetic

The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid.This Wiluna total count grid geodetic has a cell size of 0.00083 degrees (approximately 88m) and shows the terrestrial dose rate of the Wiluna, WA, 1991. The data used to produce this grid was acquired in 1990 by the WA Government, and consisted of 47000 line-kilometres of data at 400m line spacing and 60m terrain clearance.

辐射测量法（radiometric method），亦称伽马射线能谱法（gamma-ray spectrometric method），可通过探测地球表面附近的伽马射线自然变化，对钾（K）、铀（U）及钍（Th）的自然放射性衰变产生的信号进行检测。所采集的数据将通过标准流程进行处理，以确保记录的探测响应仅源于地下岩石。由此生成的数据集可通过解译揭示地下地质构造。经处理的数据将由澳大利亚地质调查局（GA）地球物理学家开展质量核查，以确保GA发布的最终数据满足使用需求。
地表剂量率网格由滤波后的钾、铀、钍网格经线性组合得到，随后对该网格施加低通滤波器，生成滤波后的地表剂量率网格。
此Wiluna总计数大地测量网格的像元尺寸为0.00083度（约88米），展示了1991年西澳大利亚州（Western Australia，缩写WA）Wiluna地区的地表剂量率分布。用于生成该网格的数据由西澳大利亚州政府于1990年采集，总数据长度达47000线公里，测线间距为400米，地形离地高度为60米。